garmin 720s and the map

Hi ,

as you see i am very new in using GPSMAP, I have garmin 720s , and I ,one of my frind give the red sea Map, the device arrive to see the map but do not show it in the screen , i do not what i do, really i need you help
thank you in advance for you help ,

I mean with " the device arrive to see the map but do not show it in the screen , that the device information show that there is 2 maps 1 world map and the 2end is the red sea map but only the world map is working with GPS ,
the red Map it is Garmin folder in sd named Garmin with 3 fils
1- named gmapsup its img format
2- gmapsupp its UNL file
3garminDivice its XML format
if you can help it will be greet
thank you

are you sure the Bc you had is locked ?
edit :
is your sd bigger than 2gb ?
from Garmin FAQ :If it has been some time since you last updated your chartplotter/sounder, it is possible the maximum size SD card that can be used is 2GB.
Read this thread [Only registered and activated users can see links. ]
better to update your plotter firmware

[Only registered and activated users can see links. ][Only registered and activated users can see links. ]

[Only registered and activated users can see links. ]You have to navigate to get to the good.

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